Carburetor



Oct. 7, 1930. F, Q LL ET AL GARBURETOR W. 6& l N ii v E if Filed July 29, 1926 U M u l%/flfl X \MNA w 3 f a 8 Z V m i W M Z A :5: 0 M

ATTORNEYS.

Patented Oct. 7,1930

UNITED STATES PATENT OFF-ICE- FREDERIGK 0. BALL AND THOMAS M. BALL, F DETROIT, MICHIGAN, ASSIGNOBS TO BALL 8a BALL CARBURETERCOMPANY, A PARTNERSHIP COMPOSED OF FREDERICK 0. BALL AND GORNELIA M. BALL, 0F DETROIT, MICHIGAN emcnn'ron Application filed July 29, 1928. Serial No. 185,838.

This invention is designed to improve the idling system of carburetors, The conventional idling arrangement for a plain tube carburetor in which the bypass orifice emerges at the throttle valve has some objections.

The air and gasoline going up the bypass in slugs makes a noise in idling, and also gives olf uneven hissing noise, and this also results in some unevenness in the'idling condition; With the present invention objectionable noises are obviated and a very uniform performance of idling is accomplished. Features and details of the invention will appear from the specification and claims.

' A'A, and 6 an idling well connected with the passage 3 by a metered opening 7. I

A throttle 8 is arranged in the upper part of the suction passage and is of the butterfly type and carried'by a shaft 8 in the usual manner. I a

An idling slot 9 is arranged in the wall of the suction passage in the zone of the throttle valve and permits a slight passage of idling air when the throttle is closed. An idling fuel nozzle 10 opens into the slot 9 above the throttle valve and is connected by a'tube 11 with a point in the idling well 6 to receive fuel from the well. An air nozzle connection 12 also leads to the slot 9 inposition to be influenced by the; reduced pressure above the throttle and this connection also leads to the idling well 6. An air inlet connection 13 leads to the well from any convenient source, as shown, from the suction passage, Qrmixing chamber below the throttle. Adjustmentof the idling flow of fuel may be made by ad justment of the controlling connections. As

shown this is accomplished by the needle valve 14 operating on the connection 13. The

needle valve has the handle 15.

In operation. the idling fuel, including some air, is drawn up the tube-11 and delivered through the nozzle 10. Air is drawn through the nozzle'12, the air being delivered to the well by way of the connection 13. The reduced pressure above the throttle involves the intake of fuel and air through the nozzles 10 and 12 and the restriction through the connection 13 involves a reduced pressure in the well inducing a flow of fuel .to the nozzle through the metered opening 7.

What is claimed as new is 4 1. In a carburetor, the combination of a suction'passage; a throttle in the passage; a main fuel nozzle delivering fuel to the passage below the throttle; an idling fuel nozzle leading to the suction passage above the throttle; and an idling air nozzle leading to the passage separately from and directly below the idling fuel nozzle and subjected to the reduction of pressure above'the throttle.-

2. In a carburetor, the combination of a suction passage; athrottle in the passage; a

main fuel nozzle delivering fuel to the passage below the throttle; an idling fuel nozzle leading to the suction passage above the throttle; an idling air nozzle leading to the suction passage separately from and below the idling fuel nozzle and subjected to the re-v duction of pressure above the throttle; a fuel well communicating with the idling fuel and air nozzles; and an air connection leading to the fuel well. d

3. In a carburetor, the combination of a .suction' passage; a throttle in the passage,-

said suction passage having a bypassslot ad- .jacent to the throttle and opening into the suction passage; a main fuel nozzle delivering fuel to t e passage below the throttle; an idling fuel nozzle leading to the passage above the throttle and delivering fuel through the slot; and an idling air nozzle delivering air to the slot separately from the idling fuel nozzle, said slot carrymg the air from the idling air nozzle past the idling fuel nozzle to the suction passage. A.

*4. In a carburetor, the combination of a suction passage; a throttle in the passage, said suction passage having a bypass slot adjacent to the throttle; a main fuel nozzle delivering fuel to the passage below the throttle; an idling fuel nozzle leading to the w idling passage above the throttle and delivering fuel through the slot, said slot leading to the suction passage and an idling air nozzle deliverin air to the slot separately from the el nozzle. In testimony whereof We have hereunto set our hands.

FREDERICK 0. BALL. THGMAS M. BALL. 

